Firebrand Indonesian cleric Rizieq Shihab has apologised over recent mass gatherings in Jakarta which flouted health measures to control the coronavirus and sparked fears of fresh outbreaks in the capital.

His apology came amid uncertainty over whether he has tested positive for Covid-19.

The leader of vigilante group Islamic Defenders Front, or FPI, was mobbed by thousands of supporters at the airport when he returned from self-exile in Saudi Arabia on Nov 10.

That same week, he also drew mask-less crowds to celebrate his daughter's wedding and commemorate Prophet Muhammad's birthday.

He told a virtual forum of clerics yesterday that he had cancelled plans for future gatherings and trips to the districts until the pandemic is over, adding: "I apologise that there was a build-up of people which went out of control... the followers were too enthusiastic."

His remarks came a day after he failed to show up at a police station for interrogation on the gatherings.

Police have issued a second summons for him to report today, after which they could detain him.

Mr Rizieq was first due to explain to the police on Tuesday about the Nov 14 mass event in Jakarta, when thousands of his supporters gathered to attend the wedding and mark the Prophet's birthday.

He instead sent 38 lawyers to the Jakarta police station and one of them, Mr Aziz Yanuar, told reporters that this was enough to fulfil the police summons. He told the police that Mr Rizieq needed rest as he had just been discharged from hospital.

No doctor's affidavit on Mr Rizieq's health was given to the police, a requirement for using a health reason for not fulfilling a summons.

Mr Rizieq was hospitalised at Ummi hospital in Bogor between Nov 25 and Saturday for exhaustion and took a swab test, but the result has not been reported to the Covid-19 task force, the agency that would have to carry out contact tracing if it is positive.

The task force has filed a police complaint against the hospital, which the government accused of not being cooperative when the task force wanted to administer a separate swab test on Mr Rizieq.